﻿//
// Copyright (c) 2011 Canyala Innovation AB
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
// associated documentation files (the "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
// copies of the Software, and to permit persons to whom the Software is furnished to do so, 
// subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT 
// NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH 
// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 
//

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;
using Canyala.Lagoon.Functional;

namespace Canyala.Lagoon.Reflection
{
    static public class SemanticMethodExtensions
    {
        public static void SemanticAction(this object target, object command)
        {
            var handlerType = target is Type ? (Type) target : target.GetType();
            var requestType = command.GetType();

            var methods = handlerType
                .GetMethods(BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public);

            var actionMethods = methods
                .Where(item => item.GetParameters().Length == 1 &&
                               item.GetParameters().Any(parameter => parameter.ParameterType == requestType) &&
                               item.ReturnType == typeof(void));

            if (!actionMethods.Any())
                throw new InvalidOperationException(requestType.Name);

            var args = Seq.Array(command);
            foreach (var method in actionMethods)
                method.Invoke(target, args);
        }

        public static T SemanticFunc<T>(this object target, object query)
        {
            var handlerType = target is Type ? (Type) target : target.GetType();
            var requestType = query.GetType();

            var method = handlerType
                .GetMethods(BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public)
                .Where(item => item.GetParameters().Length == 1 &&
                               item.GetParameters().Any(parameter => parameter.ParameterType == requestType) &&
                               item.ReturnType == typeof(T))
                .SingleOrDefault();

            if (method == null)
                throw new InvalidOperationException(requestType.Name);
                       
            return (T) method.Invoke(target, Seq.Array(query));
        }
    }
}
